Lifting jack



C. J. RODMAN July 2, 197729.

LIFTING JACK 2 Sheetsheet l Filed July 27l 1927 mvENToR OW R'aw n..

July 2, 1929 c. J. Rowman; 1.719.084

LIFTING JACK Filed July 27, 192'? 2 Sheets-Sheet 2 INVENTOR CNAM Patented July 2, 1929.

UNITED STATES CLARENCEJ. RODMAN, OF ALLIANCE, OHIO.

LIFTING JACK;

Application filed .Tuly 27,

This .invention relates to jacks, and particularly to a serew jack having an improved reinforced housing.

I provide a serew jael( having a base with a housing projecting therefrom, the housing being elleetive for su pportin g suitable guideivajvs which cooperate with a lift member. The housing :is also effective as a guard for the lift sereiv. rlhe base is preferably provided with an operating shaft having a bevel pinion thereon, the pinion engaging a bevel gear fastened to the lifting screw. The bevel gear is supported preferably upon an anti-friction bearing Which takes the load applied to the screw.

The housing` and the lift member are so constructed that the binding ofthe screw, which is quite frequent in acks of this type, is entirelyeliminated. lt is found in praetice that the jack operates very smoothly and easily because oil. this fact.

ln the accompanying drawings, illustrating a present profi-irreal embodiment of my invention:

Figure l is a side elevation of a jack embodying my invention;

Figure 2 a sectional View lll-ll of Figure l;

Figure 3 shows the jack with a handle in operating position; and

4liigure 4; illustrates the handle shown in .lligui'e 3 in collapsed position.

Referring to the illustrated embodiment there :is shown a jack havingl a base 2 With an ups-tending housing 3 made integral therewith. A reinforcing rib -lf lying alongside the housing 3. extends substantially the full length ot the housing and terminates in a reinforcing rib 5 which extends around the. upper end of the housing.

'Guideways G made .integral with the housing 3 and the base 2 extend the full length of the housing, and are turned outwardly` therefrom to serve as reinforcing ribs, as Well as guideivays.

,lDisposed substantially intermediate of the guideways (i is a lift screw 7. A bevel gear tl lies Wi thin the hollow base 2 and is secured to the lift screw 7. The screw 7 andv the gear 8 are fastened together in such man ner that the load. imposed upon the screw is carried by the bevel gear 8. The gear 8 rests on a roller bearing S which takes the full load of the jack, andjreduces the turning moment necessary to operate the jack.

on `the line 19.27. serial No. anar/3s.

The gear 8 is driven by a bevel pinion 9 supported on a, shaft 10, extending through a bearing portion 11 formed in the housing 2. The outer end of the shaft l() is engaged by a. collar 1:2 which shaped to receive a suitable operating handle 13.

Slidably mounted on the guideways G is a lifting member 14, provided Wi th a nut portion 111 which engages the lifting screw 6. The nut portion 1.4: is preferably disposed at the lowermost end of the lifting member 11i in order to provide the greatest possible effective operating height. n

The lifting member 14 provided with channeled side portions 15, adapted to operate on the guideways 6. The channels l5 are intercoimected by a substaidially semieireular portion 16 extending the full length of the lifting member and serving to house the active portion of the lifting screw. The lifting member 14; is reinforced by a T- shaped rib 17' extending substantially the full length of the lifting member. The hea d 18 of the T joins a lifting saddle 19 formed on the top of the lifting member 14, to reinforce the same. The outer face of the head 18 provided with teeth 20. These teeth support a lifting foot 21 which is movable up and down the lifting member as desired. The lifting foot 21 has a pai r of arms 22 which embrace the 'T rib 17, the arms 22 having lugs 23 which lit behind the head 18 of the "l" rib. The lifting foot 21 is also provided with a stop 2l which engages the supportingteeth 20. The construeti on shown found in practice to eliminate the customary binding of the sorew. It is also of advantage in that the lift member 14. lies in sueh close proximity to the screw that there is a minimum overhang7 and therefore, a minimum bending moment when a load applied to the lifting foot 21.

A short rib 25 extending from, the rounded portion 1G to the flange of the T rib 17 prevents the foot from dropi'iing oli'l the lifting member. The lifting foot may be inverted on top of the lifting saddle 1S) and so provides additional effective lifting l'ieight. It will be noted that the Channels 15 merge into the saddle 19 and are closed at the upper end,` thereby preventing dirt from falling onto the guideways. This construction also provides additional strength.

The ack mirtieularlv adapted for automobile Work by reason of its ease of operation and comparatively large mechanical advantage. T he two ribs 6 acting on the channels 15 easily resistthe turning moment imparted to the lifting member. Tt will be understood that in operation the base may tend to rotate, and that this is resisted by friction of the base on the ground and by the engagement of the lifting member on the automobile being lifted. If the base should tend to turn, the action of the lifting member on the automobile is suiicient to prevent turning of the jack and, as above stated, the ribs 6 acting in the channels 15 effectively resist relative rotational movement of one part on the other. The jack is rendered particularly strong by reason of the housing and guideways being formed integrally with the base; likewise that portion of the base which surrounds the operating pinion 9 serves to strengthen the connection between the housing and the base. l

The base 2 has an extension plate 26 which,l resists the bending moment set up by heavy loads carried on the lifting foot 21. The extension plate 2G is made of wrought metal such as steel plate. This provides a strong extension foot which requires a minimum of head room. It is not subject to breakage as a casting would be.

As shown in Figure 3, the jack is preferably operated by means of a handle terminating in a crank 27, the handle 13 being of such length that the jack is readily operable in various positionsV under an automobile or other desired load, and the crank 27 being of such dimensions that the mechanical advantage obtained is commensurate with the normal load of the jack. The handle 13 is hinged so that it may be folded into a conveniently small space when not in use. The operating end of the handle 13,a is provided with wings 13b which are rounded so that the exterior edges .13 thereof are narrower than the portions adjacent the handle proper. This permits the crank to be-'operated with the handle eX- tended at various angles to the jack without dangerof the wings 13" becoming wedged Within the socket 12 on the end of the pinion shaft 10. As described in my copending application aforesaid, the socket 12 is hollow and has an annular recess 28 formed interiorly thereof, the recess being blocked at diametrically opposite points by bosses adapted to engaee the wings 13b. Access to the interior of the socket is provided by an opening 29 (Figure 2) conforming with the contour of the winged end of the handle 13. Slots 29a forming a portion of the opening 29A and adapted to receive the wings 13b are disposed at substantially a right angle to the interior bosses which obstruct the free turning of the wings in the annular recess 28. Thus the handle may not be withdrawn directly from the socket when it is in operating position, and the jack may be maneuvered into a desired position with the handle.

While I have illustrated and described a preferred embodiment of the invention, it will be understood that it is not thus limited, as it may be otherwise embodied within the scope of the following claims.

I claim:

1. A jack comprising a base having guideways projecting therefrom, a lifting meluber adapted to slide on the guideways, said lifting member comprising channel portions adapted to cooperate with the guideways, a member connectinr the channel portions and a T rib disposed on the member substantially intermediate the channel portions, said T rib extending substantially the length ot the channel portions, and a lifting saddle on top of the connecting member, said saddle being a continuation of the head of the T rib.

2. A jack comprising a. base havingr a pair of guideways projecting therefrom, a lifting screw intermediate the guideways, a suhstantially semicircular housingr connecting the guideways and partially enclosing thel screw, a lifting member adapted to slide on the guideways, said lifting member comprising a pair of channel portions cooperating with the guideways, a substantially semicircular member connecting said channel portions and enclosing the lifting screw, and a lifting saddle on top of the connecting member, the saddle being integral with tht` channel portions and connecting melnber.

3. A jack comprising a vertically extending open sided housing, the edgesof the housing adjacent the open side thereot` `torming guideways, a recessed open sided lift member having its edges adjacent the open side adapted to co-operate with the guideways, and a lifting screw enclosed by the housing and the .lift member.

4. A jack comprising a pair of cooperating open sided recessed members` one of said members being slidable on the other, the open sides of the members facing one :mother so as to define an enclosed space, and a lifting screw in the space. i

5. A jack comprising a pair of cooperating open sided recessed members each substantially semi-circular in cross section, the edges of one of said members having guideways formed thereon, the other having its edges formed to Cooperate with such guidewaysso that the members are slidable on i one another and cooperate to define an enclosed space of generally circular cross section. and a lifting screw in such space, the lifting screw being carried by one of the members and engaging the other so as to cause relative movement therebetween.

In testimony whereof I have hereunto set my hand.

CLARENCE J. RODMAN.

l tt() llt) CERTIFlCATE 0F CORRECTIN.

Patent No. 1,719,084. Granted July 2, 1929, to

CLARENCE J. RODMAN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 15, after tite Word "other" and period insert the words "The guiticwnys 6 also serve as reinforcing ribs."; and that the said Letters Patent sixonld be read with this eorrection therein that the same muy conform to the reeord ot the ease the Patent Oiice.

Signed and seaied this 30th day of July, A. D. i929.

M. J. Moore, (Soni) Acting Commissioner of Patents. 

